Parlay calculator
A parlay (accumulator) multiplies the odds of its legs, and multiplies the bookmaker's margin with them. Four legs at -110 pay 13.28 for 1 where the fair price is 16: an edge of 16.98% against you.
The margin compounds
| Legs | Parlay pays (decimal) | Fair payout | Chance to win | Bookmaker's edge |
|---|---|---|---|---|
| 2 | 3.64 | 4 | 1 in 4 | 8.88% |
| 3 | 6.96 | 8 | 1 in 8 | 13.03% |
| 4 | 13.28 | 16 | 1 in 16 | 16.98% |
| 5 | 25.36 | 32 | 1 in 32 | 20.75% |
| 6 | 48.41 | 64 | 1 in 64 | 24.36% |
| 8 | 176.45 | 256 | 1 in 256 | 31.08% |
| 10 | 643.08 | 1,024 | 1 in 1,024 | 37.20% |
| 12 | 2,343.79 | 4,096 | 1 in 4,096 | 42.78% |
How it works
- Parlay odds = the product of the decimal odds of every leg; return = stake × parlay odds, if every leg wins.
- The chance to win is the product of each leg's true chance. With the margin removed, a leg at 1.91 is close to a 50/50 outcome.
- The bookmaker's edge on the parlay = 1 - (1 - margin of leg 1) × (1 - margin of leg 2) × ... Each leg you add raises it.
Legs on the same event are often correlated, and bookmakers price such combinations separately; this calculator treats legs as independent.
Updated: